M8 thread, not 5/16-18 or 5/16-24 so be careful. Also, the tenon in the acorn nut is flat. I added 1 stainless steel and 1 fiber disc on top and bottom. This compensated for the flat ornamental nut and eliminated any vibration. Harley didn't release this style in black back then so I was forced to go to the aftermarket and it worked. Looks great and visibility is great.
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